1. Maryam and Lan have been pen pals for two years.
2. Last Sunday, Lan took her friend to the history museum.
3. She used to walk past the mosque on the way to her primary school.
4. It seems difficult when you study abroad.
5. English is widely spoken at work.
6. There isn't any rivers or lakes in my hometown.
7. I wish I could speak English better than now.
8. English is the compulsory second language at schools.
9. Lan arrived at the airport at 6 o'clock on Sunday morning.
10. Tomorrow we are going to visit Ha Long Bay.
11. I have known him for three months.
12. Uniforms should be worn at school.

36. The road was very icy so they couldn't drive fast.

37. I went to school as usual yesterday although I had a terrible cold. 

38. The children ran away after they broke the window.

39. His brother is now working in Liverpool which is a big city of England.

40. Neither I nor him can speak Chinese.

41. The man whose wife and children are away seems very lonely.

42. I recently went back to the town where I was born.

43. The coffee was too hot so I couldn't drink it.

44. The ice is thick enough so we can walk on it.

45. The people who we met on the train to Ho Chi Minh city were very nice.

Câu hỏi: Khi phân hủy 3 gam hợp chất A, thấy trong đó có 1,8 gam cacbon, 0,4 gam hidro, và còn lại là oxi. Tìm CTĐCN và CTPT của A. Viết CTCT có thể của A.
Mng giúp mình với ạ

a) hidro - oxi
b) hợp chất - kí hiệu hóa học

Trong đơn chât kim loại, các nguyên tử sắp xếp khít nhau theo một trật tự nhất định. Trong đơn chât phi kim, các nguyên tử thường liên kết với nhau theo một số nhất định.
Đáp án đây bạn nhé.

Mọi người giúp mình với
Cần dùng bao nhiêu ml dd H2SO4 2,5M và bao nhiêu ml dd H2SO4 1M để khi trộn với nhau được dd H2SO4 1,5M ?

I think there will be: driverless car,jetpack,electric car and solar-powered car in the future.